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The AMA History Project Presents: Biography of LEROY M

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The AMA History Project Presents: Biography of LEROY M The AMA History Project Presents: Biography of LEROY M. COX c.1906 - 1981 Written & Submitted by ETT (3/1999); Transcribed & Edited by SS (12/2002); Reformatted by JS; Updated by JS (01/2012) Career: . 1944: Developed and successfully sold a wooden popgun, forming his business called Cox Manufacturing . 1945: Started producing metal racecars . 1947: Introduced the Cox Thimble Drome Champion racecar . February 1948: Began producing engine-powered racecars . 1948: Began selling Thimble Drome glow fuel . Designed and made the manufacturing machines to produce model engines in his factory . Early 1950s: Began to get more into model airplane engine production; introduced the Thimble Drome Space Bug in October 1950 . 1953: Designed model airplanes to go with his engines starting with a U-Control model called the Thimble Drome TD-1 . 1953: Was also selling the Thermal Hopper and Space Bug Junior engines . Mid-1950s: Produced the Baby Bee engine; later made the engine half-sized and called it the Pee Wee . Early 1960s: His company was producing seven different engines and seven airplanes . 1957: His company took over the flying circle at Disneyland; taught many youngsters how to fly and gave numerous demonstrations . Produced a training film called “Wally Wins His Wings” . 1952: Company became L.M. Cox Manufacturing Company, Inc. Pilot of full-sized aircraft . Early 1960: Got into producing slot cars; established Cox International in 1962: Hong Kong in 1962 to keep up with the slot car demand . 1967: Left with a large inventory when the slot car craze ended abruptly . 1969: Sold company to Leisure Dynamics, Inc., who continued to produce Cox products . Member of the Hobby Industry Association of America (HIAA) . One of the first hobby manufacturers to exhibit at the Nuremberg Toy Fair . The first in the industry to use highly sophisticated measuring equipment Honors: . 1981: Model Aviation Hall of Fame The following biography was written and submitted by Evan T. Towne who has written numerous biographies for the AMA History Project (at the time called the AMA History Program). Leroy M. Cox’s father ran a bicycle shop in Placentia, California. As a young boy, Roy developed a keen interest in mechanical devices while spending many hours in this shop and eventually put it to good later for his life work. He had been an electrician for 20 years and had run his own electrical business during part of that time, but he didn’t like that field of work. However, he found it hard to break away from it. Before World War II, he started a small photo equipment business that failed as materials were put on allocation for the war effort. In 1944, he noticed the poor grade of wooden toys and came up for a design for a wooden popgun of better quality than the toys of the period. With $2,200, he tooled up for fast production in his garage using neighborhood women for help. The popgun took off with a bang, and the business was established. In 1945, metal became available for civilian use and wooden toys became obsolete overnight. The business had been moved to an old foundry building. Realizing that metal toys would be in great demand and figuring that a toy with wheels would be a good bet, he designed a small racecar. In 1946 he and a friend, Mark Mier, tooled up the car and hired in a production crew, and orders flowed in the front door and the cars flowed out the back door. On August 6, with 20 people on the payroll, they were turning out 1,500 cars a day. On August 7, 1946, after four months of production, some accidentally spilled paint thinner caught on fire and within 12 minutes, the entire factory was reduced to a heap of ashes. Little was saved – but the precious orders! Without insurance, he did some fast talking and working. Leroy bought a small lot and within four days had a small Quonset-type building thrown up on it. By October 15, he was back in business and geared for double the capacity. He filled all of the orders for the Christmas trade! In 1947, he introduced the Cox Thimble Drome Champion racecar. Other than a push toy, this beautifully painted 9-1/2-inch aluminum car with rubber tires was provided with a bridal and cord with a handle and could be swung in large circles at high speed. It was called tether racing and became a fad all over the country. He adopted the Thimble Drone name for all of his future products. The price of the tether car was $4.95. I sold a number of them while I ran the Towne Hobby Sop. I also gave one to my young nephew. In addition to tether racing, Cox noticed that hobbyists were fascinated with the realism of this beautifully scaled racer and were installing miniature model airplane engines in them. Leroy went to Cameron Brother’s engine company and had them build a .15-cubic-inch engine unit that he could mount directly on a geared rear end to install in the Champion. The cooling fins on the crankcase were made vertical rather than around, because it was fitted in a confined cockpit area so there would be better cooling. Eventually the same engine was reduced in displacement to .099 (called the Doodle-Bug) then also to a .19 size. In February of 1948, the firm introduced the first engine-powered racecar ever to hit the market under $100. The retail price was $19.95. 1948 sales were well in excess of half a million dollars, selling cars both with and without gas engines. Of course, he was soon selling his own brand Thimble Drome glow fuel. In 1949, Cox introduced a smaller car called the Special of .045 displacement. For this, he bought piston, rod, cylinder, and head from the Mel Anderson Company. Leroy was a perfectionist and a fanatic about quality control. Eventually the entire car – engine and all – was made in the Cox plant. Many of the engine makers did not have sufficient manufacturing capacity to produce a whole engine, so they would sub-contract parts to others to supply what they were unable to. As a result, they were basically “assemblers and fitters.” Cox realized that in order to control the quality, he would have to do it himself; he even designed and made the manufacturing machines to do so. There were some parts made outside the factory, especially the plastic airplanes. The car craze was over by now and sales dropped. Late in 1949, Roy realized that he had to go in a new direction, as the cars were too expensive to manufacture in small quantities. He determined that if the dependability, quality, and starting characteristics could be greatly improved of model engines, a mass market would be waiting for a complete line of engine- powered models, especially airplanes. Most of the year was devoted to experimenting, developing and design tools to create a new tiny glow plug engine of .049-cubic-inches displacement (called a half-A) with superior starting capability. His first engine hit the market about October 1950. It was called the Thimble Drome Space Bug. Ads are not a very good way of determining when a certain product hit the market, but it is about all that I have to go by. As soon as the engine came out, the modelers learned of its good starting qualities and power. With engines selling well, he was in no hurry to buy ads in model magazines. Consequently, the first ad that I found in Model Airplane News magazine was the August 1952 issue on page three. There was a full-page ad with a black glow plug instead of a glow head. (This was the prototype engine and probably an artist-rendered plug.) Right away Roy started working on production machines to create models for the new engine. The Space Bug engine was quite a remarkable advance in engine design. It had a compact cast aluminum crankcase fastened to a rather large cast aluminum gas tank. The tank held a reed- valve fuel induction system and was radial-mounted to the firewall by four screws. The piston- connecting rod was ball and socket rather than having a wrist pin. The most amazing feature was the steel cylinder-piston combo that was machined to fantastically close tolerances. Instead of a glow plug, it had an aluminum glow head with a built-in glow coil of his design. By 1953, he was selling three different versions of the Thimble Drome engine. The Space Bug sold for $6.95. By demand, the heavy tank was removed for the modelers and it was called the Thermal Hopper for $6.95. Then Space Bug Junior with a plastic tank for $3.95. The first engine review in Model Airplane News magazine was in May 1953 on page 29. This sparked a new wave of enthusiasts. The first plane was advertised in the August 1953 issue of Model Airplane News magazine and called the Thimble Drome TD-1. It was a U-Control model that weighed 10 ounces, an aluminum wing of 24-1/2-inches and the body of high impact plastic was 18-inches long. It came completely assembled, ready to fly. For $19.95, it came with an accessory kit including Skylon control reel, battery wires, battery connecting clip, control lines, filler hose, and finger guard in a three-color box, plus complete instructions. The engine was soon winning practically all the ½-A contests. Cox then moved the factory to Santa Anna, California, and into two Quonset huts and a two-story cement block building.
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